Among the reasons for the rapid and peaceful spread of Islam was the simplicity of its doctrine - Islam calls for faith in only One God worthy of worship. It also repeatedly instructs man to use his powers of intelligence and observation.

Within a few years, great civilizations and universities were flourishing, for according to the Prophet, 'seeking knowledge is an obligation for every Muslim man and woman'. The synthesis of Eastern and Western ideas and of new thought with old, brought about great advances in medicine, mathematics, physics, astronomy, geography, architecture, art, literature, and history. Many crucial systems such as algebra, the Arabic numerals, and also the concept of the zero (vital to the advancement of mathematics), were transmitted to medieval Europe from Islam. Sophisticated instruments which were to make possible the European voyages of discovery were developed, including the astrolabe, the quadrant and good navigational maps.

The Quran is a record of the exact words revealed by God through the Angel Gabriel to the Prophet Muhammad. It was memorized by Muhammad and then dictated to his Companions, and written down by scribes, who cross-checked it during his lifetime. Not one word of its 114 chapters, Suras, has been changed over the centuries, so that the Quran is in every detail the unique and miraculous text which was revealed to Muhammad fourteen centuries ago.

The Quran, the last revealed Word of God, is the prime source of every Muslim's faith and practice. It deals with all the subjects which concern us as human beings: wisdom, doctrine, worship, and law, but its basic theme is the relationship between God and His creatures. At the same time it provides guidelines for a just society, proper human conduct and an equitable economic system.

Yes, the sunna, the practice and example of the Prophet, is the second authority for Muslims. A hadith is a reliably transmitted report of what the Prophet said, did, or approved. Belief in the sunna is part of the Islamic faith.

'None of you truly believes until he wishes for his brother what he wishes for himself.'

'He who eats his fill while his neighbor goes without food is not a believer. '

'The truthful and trusty businessman is associated with the prophets the saints, and the martyrs.'

'Powerful is not he who knocks the other down, indeed powerful is he who controls himself in a fit of anger. '

'God does not judge according to your bodies and appearances but He scans your hearts and looks into your deeds.'

'A man walking along a path felt very thirsty. Reaching a well he descended into it, drank his fill and came up. Then he saw a dog with its tongue hanging out, trying to lick up mud to quench its thirst. The man saw that the dog was feeling the same thirst as he had felt so he went down into the well again and filled his shoe with water and gave the dog a drink. God forgave his sins for this action.' The Prophet was asked: 'Messenger of God, are we rewarded for kindness towards animals?' He said, 'There is a reward for kindness to every living thing.'

There is no god worthy of worship except God and Muhammad is His messenger. This declaration of faith is called the Shahada, a simple formula which all the faithful pronounce. In Arabic, the first part is la ilaha illa Llah - 'there is no god except God'; ilaha (god) can refer to anything which we may be tempted to put in place of God - wealth, power, and the like. Then comes illa Llah: 'except God', the source of all Creation. The second part of the Shahada is Muhammadun rasulu'Llah: 'Muhammad is the messenger of God.' A message of guidance has come through a man like ourselves.

Salat is the name for the obligatory prayers which are performed five times a day, and are a direct link between the worshipper and God. There is no hierarchical authority in Islam, and no priests, so the prayers are led by a learned person who knows the Quran, chosen by the congregation. These five prayers contain verses from the Quran, and are said in Arabic, the language of the Revelation, but personal supplication can be offered in one's own language.

Prayers are said at dawn, noon, mid-afternoon, sunset and nightfall, and thus determine the rhythm of the entire day. Although it is preferable to worship together in a mosque, a Muslim may pray almost anywhere, such as in fields, offices, factories and universities. Visitors to the Muslim world are struck by the centrality of prayers in daily life.

A translation of the Call to Prayer is:

God is most great. God is most great. God is most great. God is most great. I testify that there is no god except God. I testify that there is no god except God. I testify that Muhammad is the messenger of God. I testify that Muhammad is the messenger of God. Come to prayer! Come to prayer! Come to success (in this life and the Hereafter)! Come to success! God is most great. God is most great. There is no god except God.